MQ303A Class Reference

API for the MQ303A Alcohol Sensor. More...

Detailed Description

• ID: mq303a
• Name: MQ303A Alcohol Sensor
• Other Names: Grove Alcohol Sensor
• Category: gaseous
• Manufacturer: seeed
• Link: http://www.seeedstudio.com/wiki/Grove_-_Alcohol_Sensor
• Connection: analog gpio
• Kit: tsk

UPM module for the MQ303A alcohol sensor. This sensor needs to be warmed up before stable results are obtained. The higher the value returned from value(), the higher the amount of alcohol detected.

  // Instantiate an mq303a sensor on analog pin A0

  // This device uses a heater powered from an analog I/O pin. 
  // If using A0 as the data pin, then you need to use A1, as the heater
  // pin (if using a grove mq303a).  For A1, we can use the D15 gpio, 
  // setup as an output, and drive it low to power the heater.

  upm::MQ303A *mq303a = new upm::MQ303A(0, 15);
  
  cout << "Enabling heater and waiting 2 minutes for warmup." << endl;
  mq303a->heaterEnable(true);
  sleep(120);

  cout << "This sensor may need to warm until the value drops below about 450." 
       << endl;

  // Print the detected alcohol value every second
  while (shouldRun)
    {
      int val = mq303a->value();

      cout << "Alcohol detected (higher means stronger alcohol): " 
           << val << endl;

      sleep(1);
    }

Public Member Functions
	MQ303A (int pin, int heaterPin)
	~MQ303A ()
int	value ()
void	heaterEnable (bool enable)

Constructor & Destructor Documentation

MQ303A	(	int	pin,
		int	heaterPin
	)

MQ303A constructor

Parameters

pin	Analog pin to use
heaterPin	Digital pin mapped to the analog pin to use

~MQ303A

(

)

MQ303A destructor

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Member Function Documentation

int value

(

)

Gets the alcohol reading from the sensor. The value read from the analog pin is inverted. A higher returned value means a higher amount of alcohol detected.

Returns

Alcohol reading

void heaterEnable

(

bool

enable

)

Enables the heater

Parameters

enable

Enables the heater if true; otherwise, disables it

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The documentation for this class was generated from the following files:

• /iotdk/jenkins/workspace/upm-doc-stable/src/mq303a/mq303a.h
• /iotdk/jenkins/workspace/upm-doc-stable/src/mq303a/mq303a.cxx